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Finding the Fourth Proportional to 13,915.92, 20,870.16 and 3,920.07

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Solution

The fourth proportional to 13,915.92, 20,870.16 and 3,920.07 is: 5,879.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,915.92 : 20,870.16 = 3,920.07 : x
  2. Step 2: Convert to fraction form
    13,915.92/20,870.16 = 3,920.07/x
  3. Step 3: Cross multiply
    13,915.92x = 20,870.16 × 3,920.07
  4. Step 4: Simplify right side
    13,915.92x = 81,812,488.11
  5. Step 5: Solve for x
    x = 81,812,488.11/13,915.92
  6. Step 6: Final answer
    x = 5,879.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.